page_title: Porsche 919 Hybrid
section_title: 2017 version
hierarchical_section_title: Porsche 919 Hybrid / Subsequent alterations / 2017 version
caption_attribution_description: English: Pietro De Grandi 2017-05-09
context_page_description: The Porsche 919 Hybrid is a Le Mans Prototype 1 racing car built and used by Porsche in the 2014, 2015, 2016 and 2017 seasons of the FIA World Endurance Championship. It has a two-litre 90-degree V4 mid-mounted mono-turbocharged petrol engine that produces 500 hp and acts as a chassis load-bearing member - and two separate energy-recovery hybrid systems to recover thermal energy from exhaust gases and convert kinetic energy into electrical energy under braking for storage into lithium-ion battery packs. In accordance with the 2014 regulations, the vehicle was placed in the 6 MJ class.
  On 4 March 2014, the 919 Hybrid was shown to the press for the first time during the Geneva Motor Show. Porsche supplied two cars, driven by six drivers, for the season. Romain Dumas, Neel Jani and Marc Lieb won three pole positions and the season-ending 6 Hours of São Paulo as Timo Bernhard, Brendon Hartley and Mark Webber helped the team to finish third in the World Manufacturers' Championship.
  In 2015, the car was further developed and was categorized into the 8 MJ category.
context_section_description: According to Porsche, it retained the monocoque from 2016, but 60 to 70% of the 2017 car was new, with the largest alterations being to its aerodynamic demands. This included a major redesign of the front of the 919 Hybrid with wider arches for the front wheels to make it less aerodynamically sensitive from small bits of discarded rubber from the track surface. To the car's side, a new channel from the monocoque to the wheel arch was made visible, along with redesigned rearward air intakes for the radiators to cool the engine. New cost-cutting regulations mandated LMP1 teams to slow the cars and use just two aerodynamic packages for the season, restricting the amount of flexibility depending on the type of track. One aerodynamic alteration raised the front splitter to lower its cornering speeds and featured two strakes on its underside. Porsche elected for a low-downforce package that minimised air resistance at the 24 Hours of Le Mans and a second that compensated for an increased amount of drag and downforce for tighter circuits. 
  Porsche remained in the 8 MJ (2.2 kWh) MGU category for the 2017 season. The engine was modified to be lighter and more compact, and Porsche stated that it was its most-efficient ever. The power output was less than 500 hp (370 kW) and slightly more than 400 hp (300 kW) when the car's dual kinetic-energy recovery systems were active, for a total of 900 hp (670 kW). Approximately 60% of kinetic energy produced under braking was recovered by its front kinetic energy recovery system, and the remaining 40% was generated by the rear dual exhaust pipe system. Exhaust gases allowed the turbine to run at more than 120,000 rpm, operating a MGU that converted kinetic energy into electricity and stored it into the third-generation lithium-ion battery. The turbine was designed to run efficiently with variable geometry when there was low exhaust pressure at low speeds. The 919 Hybrid's livery was changed to white and black, with grey and red lines adorning its body.
  In December 2016, testing of the car began at the Ciudad del Motor de Aragón for one week. Two months later, the team returned to the track for five days of further vehicle-development testing and endurance runs of 7,200 km (4,500 mi). The first spy photographs of the 2017 919 Hybrid testing at the Circuit Paul Ricard were published on 27 March 2017. Four days later, the car was officially revealed to the press. The two cars ran with its six drivers in the official two-day pre-season test session at the Autodromo Nazionale Monza.
caption: The 2017-specification Porsche 919 Hybrid being tested at the Autodromo Nazionale Monza
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